GERİ DÖNÜŞTÜRÜLMÜŞ ÇELİK LİF VE CAM ELYAFI KULLANILARAK GÜÇLENDİRİLMİŞ GEOPOLİMER BETONLARIN KIRILMA DAVRANIŞININ İNCELENMESİ

Year 2024, Volume: 27 Issue: 2, 386 - 400, 03.06.2024

Hakan Bayrak , Muhammed Gümüş

https://doi.org/10.17780/ksujes.1375200

Abstract

Geopolimer kompozitlerin gevrek davranışı, dünya çapında yaygın kullanımı için bir sorundur. Bu nedenle geopolimer karışımına süneklik sağlamak amacıyla çeşitli tiplerde lifler eklenmiştir. Bu çalışmada, geri dönüştürülmüş çelik liflerin üretim sürecindeki düşük karbon emisyonundan yararlanmak amacıyla, geri dönüştürülmüş çelik elyaflar cam elyaflarla birlikte hibrit formda kullanıldı. Toplam lif içeriği hacimce %0,6 sabit olarak alınmıştır. Beş farklı geopolimer karışımı hazırlanmış ve her karışım için iki beton prizma dökülmüştür. Bu prizmalar üç noktalı yükleme altında test edildi ve numunelerin yüzeyinin deforme şekli, yüzey yer değiştirme alanını oluşturmak için dijital kamera ile kaydedildi. Çentikli prizmaların kırılma özellikleri (i) yük-CMOD davranışı, (ii) çentik önündeki çatlak ilerlemesi, (iii) kırılma enerjisi, (iv) nihai yük taşıma kapasitesi ve (v) kararsız kırılma tokluğu açısından değerlendirildi. Test sonuçları, hibrit karışımdaki geri dönüştürülmüş çelik lif oranının artmasıyla birlikte lifli geopolimerlerin artık dayanımları, nihai yükü ve kırılma enerjisinin azalma eğiliminde olduğunu ortaya çıkardı. Bu durumun geri dönüştürülmüş çelik liflerin beton içerisindeki heterojen dağılımından kaynaklandığı düşünülmektedir.

Keywords

Geopolimer, atık çelik lif, cam lifi, dijital görüntü korelasyonu, çentikli prizma

INVESTIGATION OF THE FRACTURE BEHAVIOR OF GEOPOLYMER CONCRETE REINFORCED WITH RECYCLED STEEL AND GLASS FIBERS

Abstract

The brittleness of the geopolymer composites is an issue for its widespread use worldwide. Therefore, several types of fibers have been added to the geopolymer mixture to provide a ductile manner. In this work, the recycled steel fibers were employed in a hybrid form with glass fibers to take advantage of the low carbon emission in the production process of recycled steel fibers. The total fiber content was taken as constant 0.6% by volume. Five dissimilar geopolymer batches were handled and two concrete prisms were cast for each batch. Those prisms were tested under three-point loading and the deformed shapes of the specimens’ surface were captured by digital camera to generate the surface displacement field. The fracture characteristics of the notched prisms were criticized in terms of (i) load-CMOD response, (ii) crack progress ahead of the pre-notch, (iii) fracture energy, (iv) ultimate load-bearing capacity, and (v) unstable fracture toughness. Test results revealed that the residual strength, the ultimate load, and the fracture energy of fiber-reinforced geopolymers had a decreasing trend with the increasing recycled steel fiber ratio in the hybrid blend. The reasonable cause of that finding was the heterogeneous distribution of the recycled steel fibers.

Keywords

Geopolymer, recycled steel fiber, glass fiber, digital image correlation, notched prism

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